On The Gist, music writer Chris Molanphy guides us through the purple rain. We’ll remember Prince’s impact on the Billboard chats over the course of his career. Chris writes Slate’s Why Is That Song No. 1 column. He recently wrote about Prince for Slate: “How Prince Ruled the Charts in the ’80s—Even When His Name Wasn’t on the Songs.” For the Spiel, where should we draw the line when it comes to how we treat our prisoners?Learn more about your ad choices. Visit megaphone.fm/adchoices